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"To decrease the potential for fine coal waste slurry impoundment failures, the Bureau of Mines investigated a new disposal technique. The fine coal waste slurry is rapidly thickened (i.e., dewatered) and deposited on a slightly sloping surface. To accomplish rapid dewatering, a chemical flocculation system using polymers was developed to treat the fine coal waste slurry stream. The fine solids formed flocs, settled from suspension, and rapidly released excess water. During the last 5 days of the field test, slurry flowing at rates from 498 to 675 gal/min with a specific gravity range of 1.15 to 1.33 Was successfully treated and dewatered. During this period, untreated slurry had an average moisture content of 227.4 pct (30.7 Wt pct solids). The effectiveness of the dewatering system was determined by monitoring the moisture content of the deposited waste with respect to time. Sixty-five hours after ending the field test the average moisture content was 54.9 pct (64.5 Wt pct solids); 68 days after the field test the average moisture content was 28.8 pct (78.0 Wt pct solids)." - NIOSHTIC-2

"The Bureau of Mines is investigating a dewatering technique for coal- clay waste that uses a flocculant, polyethylene oxide (peo). This flocculant forms strong stable flocs that can be dewatered on a static screen. A field test unit (ftu) using this...

"The Bureau of Mines conducted a feasibility study and designed an operational system for consolidating waste coal sludge in a 110-acre pond by applying direct current between buried and floating electrodes. Consolidation would reduce the sludge to h...

The U.S. Bureau of Mines (USBM) was established in the public interest to conclude inquiries and scientific and technologic investigations on mining and the preparation, treatment, and utilization of mineral substances; to promote health and safety i...

"The U.S. Bureau of Mines developed a dewatering technique for treating wastewater that was tested on waste slurry from a commercial tile company in Alabama. Raw wastewater samples were pretreated with 10 lb calcium chloride and 10 lb Wyoming bentoni...

"The Bureau of Mines is investigating a method of dewatering flocculated fine-particle waste that involves treating the waste with a high-molecular-weight polymer such as polyethylene oxide (peo) followed by dewatering on a static screen and/or in a ...